I love how 2nd ammendment rights advocates forget their allegiances when the situation involves black people. Grade A stuff.
You didn't indicate who you're addressing this to, but since I posted that a major justification for the lack of charges against the police was that they were fired upon, I'll take a crack at answering. I'm not a huge fan of the 2nd Amendment as it's interpreted by many right wing Republicans, so I hope that doesn't disqualify me.
This is a quote from a Kentucky guns rights website:
"Kentucky is a Castle Doctrine state and has a “stand your ground” law. A person who is not engaged in an unlawful activity and who is attacked in any other place where he or she has a right to be has no duty to retreat."
The boyfriend was certainly in a place where he had a right to be. The warrant may cause some doubt as to the unlawful activity, but let's leave that for now. He says that he didn't know who was breaking in and was defending himself. All of that would seem to meet the requirements outlined above, but I haven't looked at Kentucky law to confirm it. He was originally charged with unlawful use of a firearm, but those charges were later dropped, presumably because of his defense under the Castle Doctrine.
The Castle Law worked as intended. That said, more than one factor was in play. The police had a legal warrant and they came under fire while executing it. It was shitty police work and a crappy no-knock law, but that doesn't change the fact that once under fire in the course of executing a warrant, the police too have a right to defend themselves. The Castle Doctrine doesn't require a police officer to sit back and wait to be shot.
Shooting guns at people, even if lawful, can have horrible consequences. The truly awful part of this whole thing is that it was Breonna Taylor who paid the price. It's dreadful and it should never have happened. The whole judicial system failed. No-knock warrants suck. In my view, there was no justifiable reason for the police to break into the apartment. They had the place surrounded. They could have simply contacted the folks inside by phone or bullhorn or some sane form of communication other than breaking down the door, and demanded that they surrender. The City agreed that they were culpable in the loss of Ms. Taylor's life and paid a large settlement.
Awful police work still doesn't mean that the officers involved violated any laws. I want changes in the way the police operate and I will work to demand that Blacks are treated equally. I will not take the position that the death of any Black person at the hands of police should be treated the same. They have to be judged based on the individual circumstances and weighed against the laws in effect at the time of the incident. Otherwise we're just vigilantes.